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doc: clarify the effect of concurrent work_mem allocations 

Reported-by: Sami Imseih

Discussion: https://postgr.es/m/66590882-F48C-4A25-83E3-73792CF8C51F@amazon.com

Backpatch-through: 11
This commit is contained in:
Bruce Momjian 2023-09-26 19:44:21 -04:00
parent ba0eb75dac
commit a4a8c0de2b
1 changed files with 4 additions and 3 deletions
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doc/src/sgml/config.sgml
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@ -1582,9 +1582,10 @@ include_dir 'conf.d'
Specifies the amount of memory to be used by internal sort operations
and hash tables before writing to temporary disk files. The value
defaults to four megabytes (<literal>4MB</literal>).
Note that for a complex query, several sort or hash operations might be
running in parallel; each operation will be allowed to use as much memory
as this value specifies before it starts to write data into temporary
Note that a complex query might perform several sort and hash
operations at the same time, with each operation generally being
allowed to use as much memory as this value specifies before it
starts to write data into temporary
files. Also, several running sessions could be doing such operations
concurrently. Therefore, the total memory used could be many
times the value of <varname>work_mem</varname>; it is necessary to